[turbofan] Enable typed lowering of string addition.
Unfortunately StringAdd is not pure in V8 because we might throw an exception if the resulting string length is outside the valid bounds, so there's no point in having a simplified StringAdd operator. R=jarin@chromium.org Review URL: https://codereview.chromium.org/1164743002 Cr-Commit-Position: refs/heads/master@{#28747}
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